Disazo dyestuffs contalgmd



Patented May 5, 1953 UNITED STATES PATENT OFFICE nIsAzo DYESTUFFS ooNrAntlN COPPER Walter Anderau, Basel, Switzerland assignor to Ciba Limited, Basel, Switzerland, a Swiss firm ,Nollrawing. Application May 17, 1950, Serial No. 162,611, In Switzerland August 1949 n 4 Claims. (enact- 148) The present invention relates to the niaiiu- 4:8- or 3t6=disulfonic acid, 2=-h$7droxynaphthafatur'e of new and vaiuttme disoy'ze dyestuffs con le'he' 628 or =3 zfi disulfo'riic acid and especially bfiifiiiig copper; These dyestuffs are l=hydfiixynaphthalne=3:S diSUlfbIliC acid. f'iii'rd, -affioldirig to this iiiii'litiofi; by subjecting Moreover Silbh di'sazo dyestuffs 6f the above a disazo dyestuff, wnieh as tree acid corresponds getter-a1 formulaniay be employed as starting ma to the general formula terials as are symmetrically constituted and in Alkyl-fi) (')Alkyl 0H cote-coon in which R indicates a naphthalene" radical with which the radical Riikwise corresponds to the atthe most two sulfonic acid groups, which radiformula cal is coupled in ortho position to a hydroxyl t OH group,- to the action of an agent providing oopt l per, under such conditions that splitting up or the O alkyl groups takes place with formation 3000-326 t of the ozo'- dihydroxyazo copper complexes. SO3H The disazo dyestufis serving as starting ma=- serials in the p t protss ay be ob ained When two different coupling components are f r ple by coup a tetrazotiz'ed 3:3'-diemployed the sequence of the two cou lings may alkoxy-'z4' diaminodiphenyl, especially diariis'i be as desired; advantageously the coupling with dine; in either sequence, on one side with 2-(ca-r the more difficulty coupling component is car boxymethoxyphenyl) arnimJ-a e hydroxynaphthried out first;

athlerie-hsulfeinic acid and on the other side The carboxymethoziy group -OCH2'COOH with acoupling component of the naphthalene may take up various positions in the phenyl nuseries containing at the most twosulforiic acid cleus with respect to the group, for example groups and coupling in o=position to ahydroxyl the frietabut more advantageously the para-pogroup. sitien to the group.

As such naphthalene components eoupnfig Ari especially valuable dyestuff is obtained ac o-pcsition to a hydrox'yl roup, use may be mace cording to the present'invention by the applica for example of those containing no Sui-tonic acid not: of the start-mg'ey'estuff of the formula.

liot s or; E560 ooiit Ho H038 mnOmtwemE group, such as 2-hydroxynaphthalene or l-hy- According tothe present invention the disazo droxy-4-methoxynaphtha1ene, or those containdys'tufis are treated in such away with an agent its only one sulfomc acid gr'oup such as 2 hyproviding copper that with splitting up of the df'iiynabhthalene-- Oi fi -silifdni tid O1 1;- alkoxy, especially methOXy, roups contained in hydi'iiytiaphthaienaS- -4- or 5-'sulfonic aid the diai'nihodiphenyl components, the corre- However hydroxi'nai hthalenes may be employed spending oio 'dihydroxyazo copper complexes with advantage which contain two sulf ohic acid are produced. Methods which lead to such a degroups, Silc'h as 1-eu1 ro-smyuroxyuephth ieue alkylating coppering are generaiiy known. In fiffiedififllffifiifi acid, 1mystery:s tukostyngphtha may" eases that process has proved especially renters-attention acid; i l'ii di oityiiaphthalfie so suitsbie according to which, with the application copper complexes derived therefrom.

The new dyestuffs of the present invention contain o:o-dihydroxyazo copper complexes and correspond to the general formula .Ls N' OMm '4 trated ammonia and stirred for a few hours at 90-l00 0., whereby the coppering takes place with the formation of the o-o'-dihydroxyazo complexes. The dyestuflf containing copper is separated by addition of 200 parts of sodium chloride, filtered and dried.

The coppering can also be carried out with advantage with copper acetate or a mixture of copper sulfate and sodium acetate at temperatures above 100 C., for example by drying and heating for a few hours to about 125 C. the reaction mixture or the complex primarily produced (that is to say, the copper compound produced by the ac- OCHr-CO OH in which R indicates a naphthalene radical con tion on the dyestuff of the agent providing coptaining at the most two sulfonic acid groups, the

azo and the OCu group being in o-position to HOaS SQIH

H 0 as The new copper-containing azo dyestuffs of the present invention can be employed for the dyeing and printing of a wide variety of materials such as wool and silk but especially fibers containing cellulose such as cotton, linen and also artificial silk and staple fiber from regenerated cellulose. Blue dyeings are obtained of good fastness to light, which withstand a customary crease-proof treatment, for example by means of urea-formaldehyde artificial resins.

The following examples illustrate the invention, the parts and percentages being by weight:

Example 1 24.4 parts of dianisidine are suspended in 200 parts of water and 50 parts of hydrochloric acid of per cent. strength and tetrazotized at ,0-2 C. with 14 parts of sodium nitrite. The clear solution of the tetrazo compound is caused to fiow as rapidly as possible into an ice-cold solution of 32 parts of 1-hydroxynaphthalene-3z'8-disulfonic acid and 30 parts of anhydrous sodium carbonate in 450 parts of water. After about 15 minutes the formation of the diazoazo compound has taken place whereupon an ice-cold solution of parts of 2-(4-carboxymethoxyphenyl) -amino 5 hydroxynaphthalene-7-sulfonic acid and 10 parts of anhydrous sodium carbonate in 300 parts of water is allowed to flow in. After a few hours the suspension of the disazo dyestufi produced is heated to 60 0., about 150 parts of sodium chloride are added and the dyestuif which now precipitates is filtered off. i

A solution of this dyestuff paste in 2000 parts of water prepared at 80 C. is treated with 52 parts of copper sulfate and 200 parts of concenper and in which no splitting up of the methoxy groups of the diphenyl radical has yet taken place).

A dark powder is obtained which dissolves in water with a pure blue color and dyes cotton and artificial silks from regenerated cellulose from a bath containing sodium sulfate in pure blue shades of good fastness to light.

The coppered dyestufi has the formula A cupriferous dyestuff of quite similar properties is obtained, when the l-hydroxynaphthalene-3 :8- disulfonic acid in the above example is replaced by l-hydroxynaphthalene 4:8 disulfonic acid. The 2- (4'-carboxymethoxyphenyl -amino-5-hy-' droxynaphthalene-7-sulfonic acid can be prepared as follows:240 parts of 2-amino-5-hydroxynaphthalene-7-sulfonic acid and 240 parts of 1-amino-4-carboxymethoxybenzene are stirred to form a paste with 400 parts of water and the whole is neutralized by addition of 135 parts of anhydrous sodium carbonate. 600 parts of sodi-' umbisulfite solution of 40 per cent. strength are then added and the reaction mixture is placed in an autoclave equipped with a. stirrer and treated for 24 hours at 100 to 104 C. After cooling to 20 0., the residue is filtered'ofi, dissolved in 2000 parts of water at 70 C. with addition of 25 parts of anhydrous sodium carbonate, and 500 parts-of. sodium chloride are added. The 2-(4'-carboxymethoxyphenyl) amino-5-hydroxynaphthalene- 7-sulfonic acid thus precipitates in the form of its sodium salt in a very pure state. When the suspension has become cold, the product is filtered off and dried.

Erample 2 mamas parts of anhydrous sodium carbonate in 650 parts of water. After a few hours the suspension of the disazo dyestufi produced is heated to 60 0., about Y 100 parts of sodium chloride added and the dyestufi now precipitated filtered ofi. I

The dyestufl paste obtained is pasted witha little water to a fairly thick paste, treated with a solution of 56 parts of crystalline copper sulfate and 50 parts of crystalline sodium acetate n 500 parts of water and stirred for 10 hours. Thereupon the paste is evaporated in vacuum and when the evaporation is complete maintained" 1.51parts'of thedyestuff obtained according to i Example 1 and 1 part of anhydrousi sodium car- I customary manner. It is dyed in fast pure blue sh'ades.

for 6 hours at 125-128 C., still under reduced o olifo" pressure. The copper compound of the (aw-ai hydroxyazo dyestufr is thereby obtained as a dry blackish powder which is treated with 2-5 per cent. of its weight of anhydrous sodium carbonate.

The dyestuif powder dissolves in water with a reddish-blue color and dyes cotton and artificial silks from regenerated cellulose from a bath containing sodium sulfate in pure reddish-blue shades of good fastness to light.

The demethylating coppering of the dyestuff paste obtained according to the above directions can also take place in aqueous solution by dissolving the dyestufi paste in 4000 parts of water, treating with 55 parts of crystalline copper sulfate, 100 parts of concentrated ammonia and parts of monoethanolamine and boiling water under reflux for 12-15 hours. The copper compound of the o:o'-dihydroxyazo dyestuff thus produced is precipitated with 200 parts of sodium chloride, filtered and dried. The dyestuff powder obtained has the above specified dyeing properties.

The coppered dyestuff has the formula OCHr-COOH bonatejdyeing is carried out fur t hour-"with raising of the temperature to 90 C., parts of crystallized sodium sulfate are added and dyeing: carried out for a further hour at -95? 0.; The cotton is thereupon rinsed and finished in the What I claim is: 1 A cupriferous diazo-dyestufi of the formula I wherein 25 stands for a member of the group consisting of the radicals HO aS and 2. The cupriferous dyestufi of the formula I I I Hots o---cuo SOsH 1103s o--ou-,--o

HOaS

NHOOCHr-CO on 3. The cupriferous dyestufi of the formula 4. The cupriferous dyesiufl of the formula no 0 c-mc o WALTER ANDERAU.

Referenes 0m n; the file of this pgt gnt Number UNITED STATES Pi l TENTS Name Date Hilger et a1; Sept. 27. 1932 Stusser et a1 Nov. 29, 1932 Straub et a1. Sept. 9, 1947 

2. THE CUPRIFEROUS DYESTUFF OF THE FORMULA 